The authors compared traditional and Web-based versions of an environmental education program in terms of their effectiveness in raising knowledge and promoting attitudes of environmental issues. They used a pretest-posttest nonequivalent control group quasi-experimental design. Results showed a statistically significant increase of knowledge scores for both groups. The junior high students who received computer-assisted instruction (CAI) significantly outscored their peers who were taught traditionally in posttest knowledge scores. In addition, the CAI group demonstrated a significant increase in attitudes scores. The authors found the correlation coefficient between knowledge and attitudes to be statistically significant but low. (Contains 2 figures and 3 tables.)